The nav screen was the first thing I thought of, but I'm not technically inclined. I can install sensors and gauges, but once it gets into coding and hooking up laptops and what-not, I'm as lost as a salmon in the Sahara.
I'm going to try and call the rearview retrofit guy this week. I need to get time is all. And if the price blows me out of the water, I'll fall back on my original idea.